The Rev and vapilot
Peace. It isn't one question or the other, it's both. One is pressing, mitigation of a duplicable Fault in one specific a/c, and the other, prevention of unknown problems possible with other types. Also, what other "discrepancies" does Chinese Fuel exhibit besides low FP, if any.
Could the build up of ice in the line upstream of the FOHE in both GE and Trent meet a different obstacle (resolution) closer in? The HP in GE is "in front" of the FOHE, which also has a two pass profile for the oil, heating the Fuel more than a one pass design (Trent).
Boeing has addressed, and NTSB reviewed, the mechanism thus far. NTSB claims another incident is likely without a change in the 777-200ER. FAA has yet to speak since its AD modification. The language of the resulting Interim has "exonerated" other types, so far. Wiser, and sounder minds than mine are comfortable with the pace, what else to say??
AF